Erpobdella mestrovi is a species of troglobitic leech found only in deep caves in Northern Velebit, part of the Dinaric Alps of Croatia.

The leech was first found in Lukina jama in 1994,[1] which at 1431 meters deep is the deepest cave in Croatia.

The leech has been found in several other caves systems in Velebit such as Slovacka jama (-1320 m), Olimp (-531 m) and Velebita (-1026 m), and is currently considered endemic to Croatia.

This leech inhabits underground streams and has several adaptations to deal with a rheophilic and troglobitic lifestyle.

The leech lacks eyes, has pale skin, and strong suckers to help it move around its environment.